Rolls HE18 - Manual

HE18

BUZZ OFF

SCHEMATIC

Rolls Corporation

1/05

INPUT

OUTPUT

BUZZ OFF

INPUT

OUTPUT

MADE IN THE USA

RIGHT

LEFT

R

R

L

L

INPUT

OUTPUT

RIGHT

INPUT

LEFT

INPUT

RIGHT

OUTPUT

LEFT

OUTPUT

BUZZ

OFF

MADE IN THE USA

Removes buzz or hum

caused by ground loops

Requires no po

wer

Converts unbalanced

signals to bala

nced

HE18

HE18 Buzz Off

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e H

E

18

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a

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a

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nb

ala

nc

ed

lin

e. P

erf

ec

t fo

r m

us

i-

cians

or

audio

professionals,

the
unit

is

safe

and

convenient

to
operate.

Simply

connect

the
offending

line

into

the
input,

and

connect

the output to your next device.

- Helps eliminate ground hum and buzz

- Dual channel

-

No power required - completely passive

- Converts balanced to unbalanced

lines and vice versa

INTRODUCTION

Thank you for your purchase of the HE18 Buzz Off. If you’ve got

hum or buzz in your audio signal, the HE18 is the solution you

need. Almost all AC hum is caused by ground loops. These ground

loops act like radio antennae, picking up hum and noise. The HE18
removes many causes of noise by eliminating the ground potential.

INSPECTION

1. Unpack and Inspect the HE18 package

Your HE18 was carefully packed at the factory in a protective

carton. Nonetheless, be sure to examine the unit and the carton

for any signs of damage that may have occurred during shipping. If

obvious physical damage is noticed, contact the carrier immediately

to make a damage claim. We suggest saving the shipping carton
and packing materials for safely transporting the unit in the future

.

WARRANTY

For information on the Rolls One Year Limited Warranty, and

to register this product, visit our website at

www.rolls.com

DESCRIPTION

INPUT(S):

2 ea; 1/4” Tip-Ring-Sleeve jacks

2 ea; RCA jacks

OUTPUT(S): 2 ea; 1/4” Tip-Ring-Sleeve jacks

2 ea; RCA jacks

OPERATION

To insert the HE18 in a system with a buzz or hum, discon-

nect the device you suspect is causing the noise. Connect

that device’s Output to either of the Inputs (1/4” or RCA), and

connect the HE18 Output(s) to the next device in the signal

chain.

For example; if you’ve got a buzz in your video system, con-

nect the HE18 between the video unit and amplifier to isolate

the signals.

PLEASE NOTE: THE HE18 IS INTENDED TO RECEIVE

LINE LEVEL (0db to +4 dB) SIGNALS. DO NOT CONNECT

A MICROPHONE LEVEL SIGNAL OR A SPEAKER (POW-

ERED) LEVEL SIGNAL TO THIS UNIT.

CONNECTING A SPEAKER LEVEL SIGNAL (ie. THE

OUTPUT OF A POWER AMPLIFIER) WILL CAUSE PER-

MANENT DAMAGE TO THE HE18.

DIAGRAM

Max Out:

Bal: +18 dB

Unbal: +12 dB

Max In:

Bal: +22 dB

Unbal: +22 dB

Input Impedance:

RCA: 10 k Ohm

1/4”: 10 k Ohm balanced

Output Impedance:

RCA: 10 k Ohm

1/4”: 10 k Ohm balanced

THD:

.05% @ 1 kHz

Weight:

1 lbs. (.45 Kg)

Size:

4.15” x 2.46” x 1.55”

INPUT

OUTPUT

BUZZ OFF

INPUT

OUTPUT

MADE IN THE USA

RIGHT

LEFT

R

R

L

L

INPUT

OUTPUT

RIGHT

INPUT

LEFT

INPUT

RIGHT

OUTPUT

LEFT

OUTPUT

BUZZ

OFF

MADE IN THE USA

Removes buzz or hum
caused by ground loops
Requires no power
Converts unbalanced
signals to balanced

HE18